Journal of Tropical Oceanography ›› 2021, Vol. 40 ›› Issue (5): 111-122.doi: 10.11978/2020131CSTR: 32234.14.2020131
• Marine Geophysics • Previous Articles Next Articles
Preliminary results of the crustal structure along OBS2018-H2 in the northern continental margin of the South China Sea*
SU Xiaokang1,3(
), ZHAO Minghui1,2,3(), LI Zizheng1,3, YUAN Ye1,3, WANG Xingyue1,3, CHENG Jinhui1,3, ZHANG Jiazheng1,2
- 1. CAS Key Laboratory of Ocean and Marginal Sea Geology (South China Sea Institute of Oceanology), Innovation Academy of South China Sea Ecology and Environmental Engineering, Chinese Academy of Sciences, Guangzhou 510301, China
2. Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou 511458, China
3. University of Chinese Academy of Sciences, Beijing 100049, China
-
Received:2020-11-10Revised:2021-01-04Online:2021-09-10Published:2021-01-08 -
Contact:ZHAO Minghui E-mail:suxiaokang@scsio.ac.cn;mhzhao@scsio.ac.cn -
Supported by:Natural Science Foundation of China(41730532);Natural Science Foundation of China(91958212);Natural Science Foundation of China(42002222);Natural Science Foundation of China(91858212);Key Special Project for Introduced Talents Team of Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou)(GML2019ZD0204);Guangdong Natural Science Foundation research team project(2017A030312002)
CLC Number:
- P712.83
Cite this article
SU Xiaokang, ZHAO Minghui, LI Zizheng, YUAN Ye, WANG Xingyue, CHENG Jinhui, ZHANG Jiazheng. Preliminary results of the crustal structure along OBS2018-H2 in the northern continental margin of the South China Sea*[J].Journal of Tropical Oceanography, 2021, 40(5): 111-122.
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Fig. 1
Location of OBS2018-H2 and the bathymetry map of the northern continental margin of the South China Sea. The black square in Figure a indicates the location of Figure b. The thick solid black line indicates OBS2018-H2. The black arrow indicates the shooting direction. The yellow pentagrams indicate the IODP drilling sites. The red solid circles indicate the OBS sites. Orange solid rectangles, circles and triangles indicate magnetic anomalies C11, C10 and C9, respectively (after Briais et al, 1993). Bathymetric data are from GEBECO_2019 (http://www.geobco.net)"
Fig. 1
Fig. 2
Drilling results of IODP drilling sites U1499 and U1502. (a) Stratigraphic columns of U1499 and U1502 (modified after Larsen et al, 2018a). (b) The velocity interval model of U1502 (modified after Larsen et al, 2018b). Small squares and triangles indicate PWC (P-wave caliper) data, and small circles indicate logging data"
Fig. 2
Fig. 3
Flow chart of OBS data processing"
Fig. 3
Fig. 4
Shot point locations and OBS locations before and after relocation. The number corresponding to the shot point is its serial number. Highlight every 50 shots. OBS corresponds to its code name. OBS2018-H2 after shot point relocation: y=0.1243x+4.0068"
Fig. 4
Tab. 1
Relocation results of 10 OBS in OBS2018-H2"
| OBS 编号 | 投放位置 | 校正后位置 | 校正后 水深/m | 海水 声速/(m·s-1) | 漂移 距离/m | RMS /ms | |||
|---|---|---|---|---|---|---|---|---|---|
| 东经/(°) | 北纬/(°) | 东经/(°) | 北纬/(°) | ||||||
| 09 | 116.45648 | 18.48332 | 116.45343 | 18.48297 | 3800.2 | 1501.4 | 324.8 | 3.4 | |
| 25 | 115.88451 | 18.41252 | 115.88423 | 18.41135 | 3768.7 | 1501.3 | 131.9 | 4.8 | |
| 36 | 115.75399 | 18.39623 | 115.75665 | 18.39637 | 3766.2 | 1503.1 | 281.8 | 3.5 | |
| 37 | 116.01618 | 18.42904 | 116.01979 | 18.42997 | 3762.6 | 1500.1 | 394.2 | 4.4 | |
| 38 | 116.13817 | 18.44404 | 116.14042 | 18.44650 | 3763.0 | 1501.1 | 361.5 | 3.3 | |
| 39 | 116.23545 | 18.45643 | 116.23679 | 18.45858 | 3772.5 | 1500.2 | 277.6 | 4.7 | |
| 40 | 116.32148 | 18.46648 | 116.32100 | 18.46810 | 3781.6 | 1500.2 | 185.6 | 3.8 | |
| 41 | 116.55881 | 18.49536 | 116.55592 | 18.49517 | 3813.9 | 1498.1 | 305.6 | 4.7 | |
| 42 | 116.66120 | 18.50772 | 116.65918 | 18.50749 | 3837.5 | 1500.3 | 214.6 | 2.1 | |
| 43 | 116.76341 | 18.52016 | 116.76122 | 18.51933 | 3871.1 | 1499.1 | 248.5 | 3.7 | |
Tab. 1
Fig. 5
Contrast of direct water phases (Pw) before and after correction of OBS37. Reduced velocity is 6.0 km·s-1, and reduced travel time = travel time - offset/6"
Fig. 5
Fig. 6
Multi-channel reflection seismic profile and its horizon interpretation. (a) Original multi-channel reflection seismic profile acquired by Shiyan 2. (b) Horizon interpretation of multi-channel reflection seismic profile. The yellow dots indicate the OBS sites. The black vertical lines indicate the IODP drilling sites of U1499 and U1502. The pink, black and brown dashed lines indicate Seafloor, Tg and Moho, respectively. The green, blue and purple dashed lines indicate unconformity T30, T60 and T70, respectively. The red short lines indicate faults"
Fig. 6
Fig. 7
Corresponding parameters of time-depth conversion calculation"
Fig. 7
Fig. 8
Initial velocity model of OBS2018-H2. The yellow dots indicate the OBS sites. The curves within the sediment represent the sedimentary interfaces T30, T60, and T70 in Fig. 6. Dashed line indicates 6.4 km·s-1 velocity iso-surface"
Fig. 8
Fig. 9
Comprehensive seismic record profiles of OBS36 (a), OBS37 (b), OBS09 (c) and OBS42 (d). Reduced velocity is 6.0 km·s-1, and reduced travel time = travel time - offset/6. Pw indicates direct water wave phases, Pg indicates crustal refractive phases, PmP indicates reflective phases from Moho, Pn indicates refractive phases from uppermost mantle"
Fig. 9
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